THE DEVELOPMENT OF THE JET ELECTROMAGNETIC SYSTEM
A series of enhancements of the JET apparatus is in the process of being implemented to increase the fusion parameter n-iDT-itau-E to values required for meaningful D-T operation. Modifications to the electromagnetic system (magnets, power supplies and plasma control) are major features of the new JET development plans, for operation with magnetic limiter up to 4MA and with material limiter up to 7MA. Operation at these levels, well above design values, requires compensation of stray fields at breakdown, control of plasma current derivative during the early phase of the discharge, larger currents in the primary windings of the transformer (coil 1) and arrangements for establishing magnetic limiter configurations. To this end coil 1 will be made a 10 subcoil stack (now 8), a fast rise voltage shaping circuit and a DC power supply will be added to the present JET poloidal system, and the radial field control will be modified to cater for the magnetic limiter configuration with both one and two X-points. If the electromagnetic, thermal and mechanical assessment of the machine and power supplies, now underway, shows that the indicated extensions of the JET engineering operating space are possible, flat top currents of duration 10s and magnitude 4 and 7MA will be achieved in magnetic and material limiter configurations, respectively.
Bibliographic Reference: 14TH SOFT CONFERENCE, AVIGNON (FRANCE), SEPT. 8-12, 1986 VOL. 1, PP. 263-271 1895 P., 1986, VOL. 1 AND VOL. 2, ISBN 0 08 034935 8 WRITE TO PERGAMON PRESS, HEADINGTON HILL HALL, OXFORD, OX3 0BW (UK), PRICE: UKL 220 (FOR BOTH VOLS.)
Record Number: 1989126047701 / Last updated on: 1989-01-01
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